裂纹

In order to transfer the experimental JR curves from laboratory to real cracked components, a mathematical expression representing a family of the JR curves was constructed for steel 18G2A by using the test data of JR curves for the SENB specimens.

同时，为了将实验得到的18G2A钢的JR曲线应用于实际裂纹构件，建立了JR曲线与约束参数A2之间的关系，给出了与约束参数A2相关的JR曲线族的表达式。

The resistance of crack propagation of Al2O3 layer is large than that of FeAl layer.

与FeAl层比较， PEO陶瓷层具有较高的裂纹扩展阻力。

This paper shows that the reason causes cracking is the existence of euructic with low melting point in on and the ferric oxide on the surface of low carbon steel.

分析了裂纹产生的主要原因，即纯铜中低熔点共晶的影响及低碳钢铁锈和加热后氧化皮的影响。

A nice little crack from the fiberglass told me I had my results.

好小裂纹，从玻璃纤维告诉我，我有我的结果。

Additionally, several numerical examples are presented to discuss the effects of crack size on the field intensity factors.

最后，给出了数值算例，讨论了应力强度因子随裂纹长度变化的规律。

The results indicate that the crack is related to the chemical composition of the filler metal.

试验表明，焊接裂纹与填充材料的化学成分有一定的关系。

The results show that dynamical ductil-ity dominated final velocity of fragments. During tube expansion, the shear fracture appears preferentially a-long the adiabatic shear bands under positive stress, so the adiabatic shear band determines the size and shapeof fragments. Though the fragmentation behaviour of medium carbon Si - Mn bainific steel is close to that ofsteel 50SiMnVB, medium carbon Si - Mn bainitic steel is an ideal candidate material for the tubular bombs be-cause it is better in dynamical ductility, which can enable the tubes to gain high speeds before fragmentation.

结果表明：材料动态塑性是决定破片最终速度的主要因素；圆管膨胀时外表面形成以剪切为主的裂纹，并向内扩展，接近内表面的绝热剪切带伴随着圆管的膨胀而扩展，并未出现失稳现象，但在正应力的作用下成为优先的断裂通道、决定破片的尺寸和形态；中碳Si-Mn贝氏体钢与50SiMnVB钢的破碎性能相近，但贝氏体钢动态塑性很更好，破碎前的膨胀量较大、更有利于提高破片初速，是弹箭比较理想的候选材料。

The calculation of reliability was based on the three dimensional perturbation stochastic finite element program which was developed by ourselves.

在结构可靠性计算中，采用自行编制的基于摄动理论的三维随机有限元程序，就焊接残余应力对结构可靠性的影响进行了计算，并讨论了断裂韧度、外载荷、裂纹尺寸三个随机变量的变异对结构可靠性的影响。

The firebrick of secondary reformer dome has been turned up crack and breakage for many times maintenance,its service life is too short.

乌石化化肥厂第二套合成氨装置的二段转化炉拱顶自投运以来，拱顶砖经多次检修，仍出现裂纹和破碎现象，使用寿命过短。

Two kinds of methods to estimate the first derivative of rotating angle in the cracked section are presented.

针对J〓积分中的裂纹韧带曲率的计算问题，给出了两种简单的计算方法，即等截面梁估算法和椭圆边界变截面梁估算法。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。